SAP Menu Customization

We wanted to check if it's possible to do some menu customizations on SAP menu.

Queries:
1) Possible to hide certain item on SAP related menu from being displayed?
2) Possible to customize a global menu for all users?

I've checked online and found SAP menu has three main items such as:
a) Favorites (This is the existing menu for all users)
b) SAP Menu (This is the existing menu for all users)
c) User Menu (Not displayed now)

I guess the above SAP menu (three items) can be customized in some ways.